Thanks, soddit, you saved me having to post that. <img src="smile.gif" border="0"> Cough, FYI, if my memory serves me correctly, the (CAA-mandated) accuracy of a VOR is +/- 2 degrees, on an NDB it's +/- 5 degrees. I'm sure someone will point it out if I've got the numbers wrong.
As cough and others have pointed out, in practice there's no reason why we can't track outbound on the 067 bearing from CHT and arrive in the general vicinity of BPK - I'm sure that ATC won't mind if we're 3 degrees out over such a short distance (would they even notice??
). However, unless the law has changed since I last looked at it, (and, again, I'm sure someone will correct me if I'm wrong) it is illegal in the UK to fly a SID without the nominated navaid being serviceable. In the unfortunate, and hopefully very unlikely, event of an incident, the first question the insurance assessor will ask (as he's busy writing out a Refusal of Claim) will be along the lines of "So, Captain, at what stage did you decide to ignore the law and fly an illegal procedure?"
Sorry, Gonzo, my licence isn't worth it.